SW3211201_Supplement-EZ Form_20220121

SUPPLEMENT-EZ COVER PAGE
FORMSLCADFD
PROJECT INFORMATION
1
Project Name
Hamby Place
2
Project Area ac
43.82
3
Coastal Wetland Area ac
0
4
Surface Water Area (ac)0
5
Is this pfomect High or Low Density?
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
100
8
Will the vegetated setback remain vegetated?
Yes
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
NIA
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
1
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level Spreader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
22
Dry Pond
23
Storm Filter
24
Silva Cell
25
Ba filter
26
FOterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Chris Bridges, P.E.
28
Organization:
R. Joe Harris & Associates
29
Street address:
1186 Stonecrest Blvd.
30
City, State, Zip:
Te a Ca , SC 29708
31
Phone number(s)7
803 802-1799
32
Email:
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision; that
the information provided in the form is, to the nest of my knowledge and belief, true, accurate, and complete; and that the engineering plans,
specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here.
x
O
rr
rr
- R C
OF5ss104,
SEAL
C-4168 z z
011Y I M I I f 1r11/1/
H CARC�%,,��
\:0 c)F ESS/0.
SEAL z =
'C)Ln 043341 �z
;Par nnrrrulinitu���
Signs ure of Designer
1/2I/2-L,
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
Does this project have low density,areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMSLOADED
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
Wet Pond
5
Total drainage area (sq ft
1,908.799
811,523
6
Onsite drainage area (sq ft
1,908.799
811,523
7
Offsite drainage area (sq ft
NIA
0
8
Total BUA in project (sq ft
314339 sf
304045 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
174650 sf
168106 sf
10permitting)
New BUA not on subdivided lots (subject to
s
139689 sf
135939 sf
11
Offsite BUA (sq ft
NIA
NIA
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
0 sf
0 sf
Sidcwalk (sq ft
31875 sf
29775 sf
Roof (sq ft
0 sf
0 sf
Roadwa (sq ft
105686 sf
104036 sf
Future (sq ft
0 sf
0 sf
Other, please specify in the comment box
below (sq ft
2128 sf
2128 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
0 sf
0 sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
0 sf
0 sf
15
Existing BUA that will remain (not subject to
permitting)s ft
0 sf
0 sf
16
Existing BUA that is already permitted (sq ft
0 sf
0 sf
17
Existing BUA that will be removed (sq ft
44,896 sf
35,087 sf
18
Percent BUA
16.47%
37.47%
19
Design storm inches
5.25 in
20
Design volume of SCM cu ft
81757 cf
21
Calculation method for design volume
SCS 24-hr Preci
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
The design storm & design volume is based off the 10-yr storm event for
this site.
The 'other" BUA is drivway area inside the street ROW.

WETPOND
1
Drainage area number
1
21
Minimum required treatment volume cu ft
45637 cf
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM H:V)?
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
Na
7
Are the inlets, Outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
8
Is there an overflow or bypass for inflow volume In excess of the
desi n volume?
Yes
9
W hat is the method for dowatering the SCM for maintenance?
Pump referred
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply with General MDC 8 ?
Yes
12
Does the drainage easement comply with General MDC 9)?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
N/A
14
Is there an 0&M Agreement that complies with General MDC (11)?
Yes
15
is there an 0&M Plan that complies with General MDC 12 ?
Yes
161
Does the SCM follow the device specific MDC?
Yes
171
Was the SCM designed by an NC licensedprofessional?
Yes
WET POND
MAC FROM 0211.1053
18
Sizing method used
SAIDA
19
Has a stagelstora e table been provided in the calculations?
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl
675.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
676.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
682.00
231
Elevation of the permanent Pao[ fmsl)
682.00
24
Elevation of the top of the vegetated shelf fmsl)
683.00
25
Elevation of the temporary pouf (fmsl)
683.50
26
Surface area of the main permanent pool (square feet)
20.503 sf
27
Volume of the main permanent pool cubic feet
100359 cf
28
Average depth of the main pool feet
4.89 It
29
Average depth equation used
Equation 2
30
If using equation 3, main pool perimeter (feet)
NIA
311
If using equation 3, width of submerged veg. shelf feet
NIA
32
Volume of the forebay cubic feet)
17215 cf
33
Is this 15-20 % of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
72 in
35
Design volume of SCM (cu ft)
81757 cf
36
Is the outlet an orifice or a weir?
Orifice
37
If orifice, orifice diameter (inches)
3"
38
If weir, weir height (Inches)
NIA
39
If weir, weir length inches)
NIA
40
Drawdown time for the temporary pool (days)
3.02
41
Are the inlets) and cutlet located in a manner that avoids short-
circuiting?
Yes
42
Are berms or baffles provided to improve the flowpath?
Yes
43
Depth of forebay at entrance (inches)
84 in
44
Depth of forebay at exit (inches)
76.2 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
46
Width of the vegetated shelf (feet)
6 ft
47
Slope of vegetated shelf (H:V)
6:1
48
Does the orifice drawdown from below the top surface of the
permanentpool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC 9 is met.)NO
51
Is a trash rack or other device provided to protect the outlet system?
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
53
Species of turf that will be used on the dam and embankment
See into below
54
Hasa plantin2 plan been provided for the ve etated shelf?
Yes
ADDITIONAL INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
The dam & embankment will use the ChadottelMecklenburg FACW Meadow seed
mix. The vegitalion shelf uses several different turfs as well. All of this can be seen
in more detail on the BMP planting plan (G4.03).
Wet Pond 3 410 PM 1/20/2022